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In this photo taken from a television monitor in district court in Derry, Kathryn McDonough appears during her video arraignment Wednesday with lawyer Ryan Russman from the Rockingham County jail in Brentwood.

DERRY — The girlfriend of the man charged with murdering UNH student Elizabeth “Lizzi” Marriott was arraigned Wednesday morning on charges alleging she lied to police and obstructed their investigation of the case.

Portsmouth resident Kathryn “Kat” McDonough, 19, was ordered held on $35,000 cash bail or corporate surety at her arraignment in Derry Circuit Court.

McDonough, of 450 Greenside Ave., was arrested on Monday and charged with one felony count of hindering apprehension or prosecution and one felony count of conspiracy to commit hindering apprehension or prosecution. Both are Class B felonies, and each carries a sentence of up to 7 years imprisonment.

According to a court document, McDonough allegedly agreed with murder suspect Seth Mazzaglia to “cause the commission of the crime of hindering apprehension or prosecution.” The pair both allegedly lied to police during interviews on Oct. 12 in Newington.

There, police say, Mazzaglia and McDonough gave investigators false alibis regarding their whereabouts Oct. 9 and their interaction with Marriott that night.

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Peter and Denise McDonough watch in Derry district court Wednesday as their daughter, Kathryn McDonough, is arraigned by video from the Rockingham County Jail in Brentwood. Bail was set at $35,000 for McDonough, who is charged with lying to investigators about her whereabouts and involvement in the disappearance and death of a college student her boyfriend is accused of killing. (AP Photo/Jim Cole)

Assistant Attorney General Peter Hinckley declined to elaborate further on the charges against McDonough outside the Derry courtroom, citing the ongoing investigation. Hinckley noted authorities continue to look for Marriott's body, but nothing has turned up yet.

During the hearing, Hinckley told Judge John Coughlin Marriott's body had not been found “in no small part because of Ms. McDonough's active involvement in the conspiracy.”

Hinckley requested $50,000 cash bail for McDonough, stating although she has no prior criminal history and is of low flight risk, the young woman “attempt(ed) to disrupt the legal process.”

“It is ... important to note that the underlying crime here is the crime of murder,” he told the judge.

McDonough's attorney, Ryan Russman, appeared on a television screen with his client, who was arraigned by video from the Rockingham County House of Corrections, dressed in a red jumpsuit.

Russman said McDonough had been fully compliant in the case, noting she recently appeared when subpoenaed to a grand jury hearing with less than 24 hours' notice. Russman said she was dismissed then because she did not have an attorney.

“That's obviously significant, your honor, because it shows that she would want to participate in this investigation,” Russman said.

Russman originally requested personal recognizance bail for McDonough, noting she had graduated from high school this year and last summer, worked as a camp counselor with 14-year-olds. After posting bail he said she would return to live with her parents in the Elwyn Park neighborhood on McKinley Road in Portsmouth, where her grandparents live across the street.

Regarding her charges, Russman added, “We're talking about an allegation of deception, not an allegation of murder.”

Russman also noted McDonough was looking to return to work in Newington, where she arrested on Dec. 24 without incident. Officials would not say where McDonough worked, though Russman indicated in court proceedings she had previously worked at a Target.

Coughlin set bail for McDonough to include a 6 p.m. to 6 a.m. curfew unless accompanied by a parent.

She has also been ordered to not leave New Hampshire, and to have no contact with Mazzaglia or his parents, Joseph and Heather. Additionally, McDonough was ordered to have no possession of weapons or firearms and to sign a waiver of extradition.

McDonough did not speak during her arraignment and sat quietly next to Russman on screen. Her parents, Peter and Denise McDonough, were present in the courtroom and replied “Yes, your honor” when asked if they understood the responsibility placed on them. They declined to grant an interview to reporters following the arraignment.

Jay Nadeau, an attorney for the McDonough family, called it “suspect” that police arrested McDonough on Christmas Eve.

During the hearing, Russman also noted his client spent Christmas Day in jail, and she stressed she understood the seriousness of the allegations.

Hinckley responded in court there was “no tactical or strategic reason” for the timing of McDonough's arrest, noting he could not comment on grand jury proceedings.

Foster's Daily Democrat has learned the alleged murder of Marriott occurred during a sexual encounter, though it remains unclear whether her participation was voluntary.

In Dover Circuit Court, Foster's was denied a request to unseal court affidavits earlier this year, after petitioning for release of those documents and other investigatory materials pertaining to the case.

Seth Mazzaglia, a now 30-year-old Dover resident, was arrested on Oct. 13 and charged with second-degree murder in connection with Marriott's death, while a weeks-long search continued along the coast of the Piscataqua River between Portsmouth and Rye for Marriott's body. Officials believed her body was placed into the river off Peirce Island in Portsmouth and searched the area extensively in October.

Authorities allege Mazzaglia, who is currently being held without bail, suffocated and/or strangled Marriott.

Prosecutors say they have gathered “credible” evidence indicating Mazzaglia caused the death of Marriott inside his Dover apartment on Mill Street the night she went missing.

Marriott was reportedly planning to see a female friend after leaving UNH campus in Durham at about 9 p.m., according to her uncle, Anthony Hanna. Hanna said the Marriott's friend lived in an apartment on Mill Street with her boyfriend, and that she became acquainted with Marriott while they were working together at a local Target store.

Marriott failed to show up for work the following morning at Target in Greenland, and was also absent from class on Thursday, Oct. 11, prompting a widespread search for her. Many friends from her hometown of Westborough, Mass., took to Twitter with the hashtag “#findlizzi.”

In the absence of an explanation for her death, those who knew Marriott have been puzzled by the crime.

Mazzaglia, an aspiring actor and 2006 UNH theater graduate, was described by friends as a “nice guy” who was enthusiastic about martial arts. He holds a black belt in karate, and has appeared in more than a dozen local theater productions.

Mazzaglia operated a number of online accounts, including a profile on the dating website OKCupid.com under the username “DarkKaiser.” On that website, Mazzaglia indicated he did not drink or take drugs and listed his hobbies as “gaming” and “watching movies.”

The same user name, DarkKaiser, was used by a then 29-year-old Dover, N.H., man on the website FetLife.com, an online meeting place for bondage and fetish enthusiasts. The profile indicates the user is interested in a “lifetime relationship, a play partner, princess by day, slut by night, a sub.”

McDonough will next have a probable cause hearing.

Hinckley noted prosecutors are seeking to postpone Mazzaglia's grand jury indictment until late February so investigators can interview additional witnesses and process evidence.